Warner, Gertrude Chandler,  1890-1979. <br/><br/>
Mystery in the sand  
Gertrude Chandler Warner ; illustrated by David Cunningham. 
 - Chicago :  A. Whitman,  [1991?], c1971. 
 - 127 p.   ill. ;  20 cm. 
 - The Boxcar children ;  #16 .
<br/><br/> A friendly writer with a metal detector, the mysterious inhabitants of a tower house, and the discovery of a locket in the sand are ingredients for the Aldens' latest mystery. 
<br/><br/> 520  Lexile. 
<br/><br/><label>ISBN: </label>0590426737 (pbk.)  3.99